Stapler with braking mechanism

Abstract

A motor-operated stapler capable of narrowing the range of a home position zone of a cam, is provided. The motor-operated stapler includes a driver 36 which reciprocates and drives out a staple toward a sheet bundle and a drive-out mechanism 30 which causes the driver 36 to operate. A driver cam 32 is mounted on a driving shaft 31 in the drive-out mechanism 30 and the driver 36 is reciprocated once by rotation of the driver cam 32. A brake mechanism 60 is used which applies a brake mechanically to the rotation of the driving shaft 31 when the driver 36 returns to its home position.

What is claimed is:  
     
       1. A stapler with a braking mechanism, comprising: 
       a driver adapted to reciprocate for driving out a staple toward a sheet bundle;  
       a drive mechanism for actuating the driver, said drive mechanism including a driving shaft and a driving cam mounted on said driving shaft for moving said driver; and  
       a means for braking which brakes the rotation of said driving shaft mechanically when said driver returns to a home position thereof.  
     
     
       2. A stapler with a braking mechanism, comprising: 
       a driver adapted to reciprocate for driving out a staple toward a sheet bundle;  
       a drive mechanism for actuating the driver, said drive mechanism including a driving shaft and a driving cam mounted on said driving shaft for moving said driver; and  
       a means for braking which brakes the rotation of said driving shaft mechanically when said driver returns to a home position thereof;  
       wherein said means for braking comprises a brake cam mounted on said driving shaft, a brake member which is put in abutment against said brake cam, and a biasing member which urges said brake member in a direction in which the brake member comes into pressured contact with said brake cam, and when said driver returns to its home position, the force with which said brake member comes into pressured contact with said brake cam is increased to brake said driving shaft.  
     
     
       3. A stapler with a braking mechanism according to  claim 2 , wherein said brake cam has a large-diameter portion and a small-diameter portion, and when said driver returns to its home position, said brake member is brought into abutment against said large-diameter portion of the brake cam. 
     
     
       4. A stapler with a braking mechanism according to  claim 3 , wherein a brake frame is attached vertically movably to a frame which holds said driving shaft rotatably, said brake frame being urged downward by said biasing member, and said brake member is provided on said frame and is brought into pressured contact with said brake cam downward from above. 
     
     
       5. A stapler with a braking mechanism according to  claim 2 , wherein said brake member is a roller. 
     
     
       6. A stapler with a braking mechanism according to  claim 2 , wherein said biasing member is a spring.